Parasocial relationships refer to one-sided relationships in which a person develops a strong sense of connection, intimacy, or familiarity with someone they don’t know, most often celebrities or media personalities. These relationships exist only in the mind of the individual, who experiences a bond despite the lack of reciprocity.

Forming parasocial relationships is fine.

Fapping (masturbating) to nsfw content is fine (unless it is illegal or unethical).

But forming a parasocial relationship with someone you fap to feels like cheating if you are in a relationship and a poor substitute for a relationship if you are single.

A year ago I bought my wife a Mazda CX-5 diesel and paid 10K for it. Now I found out that it has an engine defect that will be extremely expensive to repair, so the car is a write-off, at best I can get 2K back.